CN201653635U - Special-purpose micro differential pressure transmitter used for gas detection - Google Patents
Special-purpose micro differential pressure transmitter used for gas detection Download PDFInfo
- Publication number
- CN201653635U CN201653635U CN200920281166XU CN200920281166U CN201653635U CN 201653635 U CN201653635 U CN 201653635U CN 200920281166X U CN200920281166X U CN 200920281166XU CN 200920281166 U CN200920281166 U CN 200920281166U CN 201653635 U CN201653635 U CN 201653635U
- Authority
- CN
- China
- Prior art keywords
- pin
- pressure
- circuit
- resistance
- integrated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
A special-purpose micro differential pressure transmitter used for gas detection is especially suitable for performing in-situ pressure measurement for industrial process automation control terminal equipments in natural gas and coal gas pipe network monitoring system, gas leak detection system, standard workshop (GMP) air supply system and down-hole ventilation detection field; it acquires in-situ pressure signal, converts it into millivolt grade electric signal, conditions and converts it into 4-20 mADC industrial standard signal, and transmits it to a subsequent analog quantity input circuit, thereby completes the measurement to the pressure signal. The transmitter comprises a pressure sensor, a signal conditioning circuit, a pressure leading joint, a housing and a cable locking device; the pressure sensor is directly welded on the circuit board; the pressure leading tube of the pressure sensor is connected with the pressure leading joint by a silicone tube; and the signal conditioning circuit is fixed in the housing. Compared with prior arts, the transmitter achieves the advantages of wide temperature range compensation and high measurement precision.
Description
Technical field
The utility model relates to a kind of special-purpose elementary errors pressure pressure of gas detection transmitter that is used for, the industrial process automation control terminal that is particularly suitable for fields such as rock gas and gaspipe network supervisory system, gas leak detection system, Standard Factory Room (GMP) supply air system, down-hole ventilation detection carries out on-the-spot pressure survey, convert the pressure signal collection at scene to millivolt level electric signal, and convert this signal condition to 4～20mADC industry standard signal and send follow-up simulated measurement input circuit to, thereby finish the measurement of pressure signal.
Background technology
At present, general its weak point of gasmetry differential pressure transmitter has pressure transducer not have temperature compensation or compensation effect undesirable, causes its adaptive capacity to environment poor; When needs are measured bidirection press, output signal at negative pressure section pressure transducer is a negative value, because traditional integrated two-wire system transformer chip such as XTR105, XTR106 can not handle negative signal, can only adjust the bridge circuit of sensor in the case, reach the purpose of transmitter span shift, and be the situation of closed loop for the sensor bridge circuit, this method of adjustment will certainly produce considerable influence to the temperature performance and the stability of sensor, thereby makes the overall performance variation of transmitter.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned weak point, provide have wide temperature range compensation, measuring accuracy is high is used for the special-purpose elementary errors pressure pressure of gas detection transmitter.
The technical solution adopted in the utility model is: this is used for the special-purpose elementary errors pressure pressure of gas detection transmitter, it is characterized in that: comprise pressure transducer, signal conditioning circuit, impulse joint, housing, cable locking device, pressure transducer directly is welded on the circuit board, the pressure guiding pipe of pressure transducer links to each other with the impulse joint by silicone tube, and signal conditioning circuit is fixed in the housing.
Signal conditioning circuit comprises adjustable constant-flow source circuit, full scale regulating circuit, instrument amplifier U1, zero-bit regulating circuit and integrated V/I change-over circuit U3, the adjustable constant-flow source links to each other with pressure transducer, the full scale regulating circuit links to each other with instrument amplifier U1 respectively with the zero-bit regulating circuit, instrument amplifier U1 links to each other with integrated V/I change-over circuit U3, integrated V/I change-over circuit U3 output 4-20mA.
The zero-bit regulating circuit comprises instrument amplifier U1, operational amplifier U2B, resistance R 8, R9, potentiometer W1,6, the 7 pin short circuits of operational amplifier U2B also connect 5 pin of instrument amplifier U1,5 pin of operational amplifier U2B connect the sliding end of potentiometer W1,8 pin of the integrated V/I change-over circuit of the one termination U3 of resistance R 8, the end of another termination potentiometer W1 of resistance R 8, the other end connecting resistance R9 of potentiometer W1,3 pin of the integrated V/I change-over circuit of another termination U3 of resistance R 9.
The adjustable constant-flow source circuit comprises operational amplifier U2A, resistance R 3, R4, R5, the wherein end short circuit of resistance R 4, R5 also connects 3 pin of operational amplifier U2A, 1 pin of the integrated V/I change-over circuit of another termination U3 of R4,3 pin of the integrated V/I change-over circuit of another termination U3 of R5, the 2 pin connecting resistance R3 of operational amplifier U2A, the 4 pin short circuits of the other end of R3 and operational amplifier U2A also connect 3 pin of integrated V/I change-over circuit U3, and 8 pin of operational amplifier U2A and 7 pin of instrument amplifier U1 connect 8 pin of integrated V/I change-over circuit U3 jointly.
The full scale regulating circuit comprises potentiometer W2, resistance R 6, the end of potentiometer W2 and sliding end and connect after connect 1 pin of instrument amplifier U1, the end of the 8 pin connecting resistance R6 of instrument amplifier U1, the other end of another termination potentiometer W2 of resistance R 6.
Compared with prior art, the utility model is used for the beneficial effect that the special-purpose elementary errors pressure pressure of gas detection transmitter had and is:
Transmitter has stronger adaptive capacity to environment; The element circuit that signal conditioning circuit adopts instrument amplifier to add integrated V/I conversion chip replaces traditional integrated two-wire system transformer chip, the negative signal that makes pressure transducer output is after amplifying through instrument amplifier, by the zero-bit regulating circuit convert thereof on the occasion of, so that the integrated V/I change-over circuit for the back uses, thereby avoided the pressure transducer bridge circuit is adjusted, element circuit also is convenient to search problem in the debug process simultaneously; Be built into the adjustable constant-flow source circuit with operational amplifier and resistance, use more convenient; The transmitter service area can be between 15V～28V, and precision can reach in 0.5%.
Description of drawings
Fig. 1 is that the utility model is used for the special-purpose elementary errors pressure pressure of gas detection transmitter front view;
Fig. 2 is the backplan of Fig. 1;
Fig. 3 is the side view of Fig. 1;
Fig. 4 is that product is opened loam cake inner structure front view;
Fig. 5 is the signal conditioning circuit frame principle figure;
Fig. 6 is the signal conditioning circuit schematic diagram.
Fig. 1-the 6th is used for the most preferred embodiment of the special-purpose elementary errors pressure pressure of gas detection transmitter.Among Fig. 1-4: 1 cable locking device, 2 low pressure end impulse joints, 3 high-pressure side impulse joints, 4 housings, 5 screw hanging holes, 6 signal conditioning circuits, 7 pressure transducers, 8 connection terminals, 9 zero potentiometers 10 are transferred the full scale potentiometer.
Among Fig. 6: U1AD623 instrument amplifier U2A, the integrated V/I change-over circuit of U2B LM258 dual operational amplifier U3XTR115 R1-R9 resistance C1-C5 electric capacity W1 zero potentiometer W2 transfer full scale potentiometer Q1 triode D1 diode D2 voltage stabilizing diode.
Embodiment
Below in conjunction with accompanying drawing 1-6 the special-purpose elementary errors pressure pressure of the gas detection transmitter that is used for of the present utility model is described further:
With reference to Fig. 1-4:
The special-purpose elementary errors pressure pressure of this gas detection transmitter, form by pressure transducer 7, signal conditioning circuit 6, low pressure impulse joint 2, high pressure impulse joint 3, housing 4, cable locking device 1, pressure transducer 7 directly is welded on the circuit board of signal conditioning circuit 6, the pressure guiding pipe of pressure transducer 7 links to each other with high pressure impulse joint 3 with low pressure impulse joint 2 by silicone tube, and signal conditioning circuit 6 is fixed in the housing 4.Connection terminal 8, zero potentiometer W19 and accent full scale potentiometer W210 are fixed in the housing 4 and draw outside the housing 4.
With reference to Fig. 5:
Signal conditioning circuit comprises adjustable constant-flow source, full scale regulating circuit, instrument amplifier IA, zero-bit regulating circuit and integrated V/I change-over circuit, the adjustable constant-flow source links to each other with sensor, the full scale regulating circuit links to each other with instrument amplifier respectively with the zero-bit regulating circuit, instrument amplifier links to each other with integrated V/I change-over circuit, integrated V/I change-over circuit output 4-20mA.
With reference to Fig. 6:
Operational amplifier U2A, resistance R 3, R4, R5 constitute constant-current source circuit, give pressure transducer 7 power supplies; 6,7 pin, resistance R 8, R9, zero potentiometer W1 that 5 pin of instrument amplifier U1 meet operational amplifier U2B constitute the zero-bit regulating circuit; 1,8 pin of instrument amplifier U1 connect transfers full scale potentiometer W2, resistance R 6 to constitute the full scale regulating circuit.
It is negative, positive that the Iexc-of constant-current source circuit, Iexc+ connect the power supply of pressure transducer 7 respectively, the output signal of pressure transducer 7 is imported 2,3 pin of instrument amplifier U1 respectively through resistance R 1, R2, adjustment by zero potentiometer W1 makes zero-bit be output as 4mA, makes full scale be output as 20mA by the adjustment of transferring full scale potentiometer W2.
The course of work is as follows:
Testing pressure affacts on the pressure transducer 7 by low pressure impulse joint 2 and high pressure impulse joint 3, after the transmitter energising, the operational amplifier U2A of signal conditioning circuit 6, resistance R 3, R4, the constant-current source circuit that R5 constitutes produces electric current voltage supply force transducer 7 work of 1mADC, when the pressure on acting on pressure transducer 7 changes, pressure transducer 7 just can be exported corresponding millivolt voltage signal, this signal is by resistance R 1, R2 is input to the input end of instrument amplifier U1, when transmitter is in zero-bit (zero-pressure or negative pressure), by operational amplifier U2B, resistance R 8, R9, the zero-bit regulating circuit adjustment that zero potentiometer W1 constitutes makes instrument amplifier be output as 0.8VDC, when transmitter is in full scale, by 1 of instrument amplifier U1,8 pin, transfer full scale potentiometer W2, the accent full scale regulating circuit adjustment that resistance R 6 constitutes makes instrument amplifier U1 be output as 4VDC, converts this 0.8VDC～4VDC voltage signal to 4～20mADC current signal by integrated V/I change-over circuit U3 then.
The above, it only is preferred embodiment of the present utility model, be not to be the restriction of the utility model being made other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solutions of the utility model content that do not break away to any simple modification, equivalent variations and remodeling that above embodiment did, still belongs to the protection domain of technical solutions of the utility model according to technical spirit of the present utility model.
Claims (4)
1. be used for the special-purpose elementary errors pressure pressure of gas detection transmitter, comprise pressure transducer, signal conditioning circuit, the impulse joint, housing, the cable locking device, pressure transducer directly is welded on the circuit board, the pressure guiding pipe of pressure transducer links to each other with the impulse joint by silicone tube, signal conditioning circuit is fixed in the housing, it is characterized in that: signal conditioning circuit comprises the adjustable constant-flow source circuit, the full scale regulating circuit, instrument amplifier U1, zero-bit regulating circuit and integrated V/I change-over circuit U3, the adjustable constant-flow source links to each other with pressure transducer (7), the full scale regulating circuit links to each other with instrument amplifier U1 respectively with the zero-bit regulating circuit, instrument amplifier U1 links to each other with integrated V/I change-over circuit U3, integrated V/I change-over circuit U3 output 4-20mA.
2. the special-purpose elementary errors pressure pressure of the gas detection transmitter that is used for according to claim 1, it is characterized in that: the zero-bit regulating circuit comprises instrument amplifier U1, operational amplifier U2B, resistance R 8, R9, potentiometer W1,6 of operational amplifier U2B, 7 pin short circuits also connect 5 pin of instrument amplifier U1,5 pin of operational amplifier U2B connect the sliding end of potentiometer W1,8 pin of the integrated V/I change-over circuit of the one termination U3 of resistance R 8, the end of another termination potentiometer W1 of resistance R 8, the other end connecting resistance R9 of potentiometer W1,3 pin of the integrated V/I change-over circuit of another termination U3 of resistance R 9.
3. the special-purpose elementary errors pressure pressure of the gas detection transmitter that is used for according to claim 1, it is characterized in that: the adjustable constant-flow source circuit comprises operational amplifier U2A, resistance R 3, R4, R5, resistance R 4, the wherein end short circuit of R5 also connects 3 pin of operational amplifier U2A, 1 pin of the integrated V/I change-over circuit of another termination U3 of R4,3 pin of the integrated V/I change-over circuit of another termination U3 of R5, the 2 pin connecting resistance R3 of operational amplifier U2A, the 4 pin short circuits of the other end of R3 and operational amplifier U2A also connect 3 pin of integrated V/I change-over circuit U3, and 8 pin of operational amplifier U2A and 7 pin of instrument amplifier U1 connect 8 pin of integrated V/I change-over circuit U3 jointly.
4. the special-purpose elementary errors pressure pressure of the gas detection transmitter that is used for according to claim 1, it is characterized in that: the full scale regulating circuit comprises potentiometer W2, resistance R 6, the end of potentiometer W2 and sliding end and connect after connect 1 pin of instrument amplifier U1, the end of the 8 pin connecting resistance R6 of instrument amplifier U1, the other end of another termination potentiometer W2 of resistance R 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920281166XU CN201653635U (en) | 2009-12-12 | 2009-12-12 | Special-purpose micro differential pressure transmitter used for gas detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920281166XU CN201653635U (en) | 2009-12-12 | 2009-12-12 | Special-purpose micro differential pressure transmitter used for gas detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201653635U true CN201653635U (en) | 2010-11-24 |
Family
ID=43118877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920281166XU Expired - Fee Related CN201653635U (en) | 2009-12-12 | 2009-12-12 | Special-purpose micro differential pressure transmitter used for gas detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201653635U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674356A (en) * | 2013-11-30 | 2014-03-26 | 成都国科海博信息技术股份有限公司 | Pressure sensor with long service life and high sensitivity |
| CN104198111A (en) * | 2014-08-21 | 2014-12-10 | 航天科工惯性技术有限公司 | Pressure sensor for downhole instrument |
| KR20160143187A (en) * | 2015-06-04 | 2016-12-14 | 주식회사 태우티앤에이 | Pressure transmitter |
| CN107806957A (en) * | 2016-09-09 | 2018-03-16 | 株式会社鹭宫制作所 | Pressure sensor, its interposer and its interposer unit |
| CN110471465A (en) * | 2019-08-29 | 2019-11-19 | 河南东旺熙朝实业有限公司 | A kind of aluminium material extruder extruding force adjusting circuit |
-
2009
- 2009-12-12 CN CN200920281166XU patent/CN201653635U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674356A (en) * | 2013-11-30 | 2014-03-26 | 成都国科海博信息技术股份有限公司 | Pressure sensor with long service life and high sensitivity |
| CN103674356B (en) * | 2013-11-30 | 2015-09-09 | 成都国科海博信息技术股份有限公司 | Long service life and the high pressure transducer of susceptibility |
| CN104198111A (en) * | 2014-08-21 | 2014-12-10 | 航天科工惯性技术有限公司 | Pressure sensor for downhole instrument |
| KR20160143187A (en) * | 2015-06-04 | 2016-12-14 | 주식회사 태우티앤에이 | Pressure transmitter |
| KR101720248B1 (en) | 2015-06-04 | 2017-03-27 | (주)태우티앤에이 | Pressure transmitter |
| CN107806957A (en) * | 2016-09-09 | 2018-03-16 | 株式会社鹭宫制作所 | Pressure sensor, its interposer and its interposer unit |
| US10481029B2 (en) | 2016-09-09 | 2019-11-19 | Saginomiya Seisakusho, Inc. | Pressure sensor, relay substrate therefor, and relay substrate unit therefor |
| CN110471465A (en) * | 2019-08-29 | 2019-11-19 | 河南东旺熙朝实业有限公司 | A kind of aluminium material extruder extruding force adjusting circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201653635U (en) | Special-purpose micro differential pressure transmitter used for gas detection | |
| CN104132674A (en) | Multi-signal output intelligent pressure transmitter | |
| CN105067492A (en) | Dust concentration meter | |
| CN208905040U (en) | A kind of mobile phone | |
| CN205138756U (en) | Wind -tunnel wind pressure monitoring pipe way frequency response correcting device | |
| CN102798497A (en) | Intelligent atmospheric pressure measuring device | |
| CN1108516C (en) | Ceramic thick film resistor pressure transducer | |
| CN202533482U (en) | 4-20 ma current transmitter circuit | |
| CN203405302U (en) | Pressure transmitter | |
| CN206330702U (en) | A kind of pressure detection circuit | |
| CN204730975U (en) | Can the pressure unit of promotion signal conversion accuracy | |
| CN201289415Y (en) | High-temperature fused mass pressure gauge | |
| CN204730977U (en) | The pressure unit for electrical stability can be promoted | |
| CN201130036Y (en) | High temperature resistant and corrosion resistant two-wire system humiture transmitter | |
| CN204788766U (en) | Pressure transmitter | |
| CN209541840U (en) | Explosion-proof liquid level transmitter | |
| CN208223667U (en) | Temperature acquisition measures transmission circuit | |
| CN210719233U (en) | Digital transmitter calibration system, digital transmitter and adjustment tool | |
| CN205483378U (en) | Ultra -low power consumption digit pressure transmitter | |
| CN105043644A (en) | Pressure transmitter capable of ensuring stability of output signals | |
| CN204988959U (en) | Dust concentration appearance | |
| CN204085771U (en) | Pressure unit | |
| CN202182794U (en) | Double-isolating pressure transmitter circuit | |
| CN104460496A (en) | Numerical control constant current source circuit based on PLC | |
| CN209570216U (en) | Facilitate the transmitter of the two-wire system loop power supply of test, maintenance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101124 Termination date: 20131212 |